Microstructural Evolution and Mechanical Properties of Nb-Ti Microalloyed Pipeline Steel

被引：19

作者：

Lan, Liang-yun ^{[1
]}

Qiu Chun-lin ^{[1
]}

Zhao De-wen ^{[1
]}

Gao Xiu-hua ^{[1
]}

机构：

[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110004, Liaoning, Peoples R China

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2011年 / 18卷 / 02期

基金：

中国国家自然科学基金;

关键词：

pipeline steel; acicular ferrite; mechanical property; electron backscattered diffraction; CHARPY IMPACT PROPERTIES; HEAT-AFFECTED ZONE; ACICULAR FERRITE; TRANSFORMATION BEHAVIOR; LOW-CARBON; TOUGHNESS; BAINITE;

D O I：

10.1016/S1006-706X(11)60024-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The correlation between microstructures and mechanical properties of a Nb-Ti microalloyed pipeline steel was investigated. The results revealed that with decreasing the finish rolling temperature and the cooling stop temperature, the matrix microstructure was changed from quasi-polygonal ferrite to acicular ferrite, as a result of improvement of both strength and low temperature toughness. by means of electron backscattered diffraction observation, an effective acicular ferrite packet contained several low angle boundaries or subboundaries plates which made important contributions to improvement of strength. It was found that many fine quasi-polygonal ferrite grains with high angle boundaries as the toughening structure were introduced into the acicular ferrite matrix to refine effective grain size and improve the toughness.

引用

页码：57 / 63

页数：7

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